If you want to use a silver dollar to buy $1 worth of goods I believe you are already free to do that.
Sure, and there is no law against a vendor offering spot melt value, or just under spot melt value worth of goods for that silver dollar if they like as an exchange rate against the U.S. Dollar.
In a barter economy a U.S. silver cartwheel would be worth at least $20 over face value, so it’s not unreasonable to keep a few in the safe. Twenty bucks is a normal amount for trade.
What I don’t understand is hoarding gold these days. How do you turn it into something spendable? Now, during the German hyperinflation holders of gold would hop a train to Switzerland and exchange gold for Swiss francs to spend in Germany (which only made the Reichsmark worth even less).
I mean, will merchants keep scales on the counter for customers who show up with a poke of gold dust like Yukon prospectors? Will they accept fox & beaver pelts in trade?
;^)